WampServer

When I put this url into browser address bar: 'mydomain.com/admin' the browser automatically change it into this: 'mydomain.com/admin/' so it adds slash at the end. I know I have directory named 'admin' in my document root directory but what if I want to display article on this address 'mydomain.com/admin' and enter the admin CMS in this address 'mydomain.com/admin/*' . If I input 'mydomain.com/admin' I always get into admin CMS. Is this problem of browser or Apache server that I'm using? In common these are different urls so it should display different content.
Sorry for my bad english, I hope that you will understand my question.
Thanks for any help.